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Ferri-kaersutite

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Formula:
NaCa2(Mg3Fe3+Ti)(Al2Si6O22)O2
The Kaersutite group minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
B: Ca dominant
CTi > 0.5 apfu and
WO > 1.0 apfu


Ferri-kaersutite is defined with
A position: Na dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
System:
Monoclinic
Colour:
Brown
Ferri-kaersutite was originally described from the Deeti volcanic cone, Gregory Rift, Rift Valley Province, Kenya (IMA2011-035). This material was later renamed Oxo-magnesio-hastingsite by Zaitsev et al.(2013) in the aftermath of the 2012 amphibole nomenclature report. Ferri-kaersutite was published from Harrow Peaks, Victoria Land, Eastern Antarctica, Antarctica by Gentili et al. (2016, IMA 2014-051).

A fluorine-dominant analogue is known: 'Unnamed (F-dominant analogue of ferri-kaersutite)'.

Classification of Ferri-kaersutite

Approved
Approval Year:
2014
mindat.org URL:
http://www.mindat.org/min-42829.html
Please feel free to link to this page.

Type Occurrence of Ferri-kaersutite

General Appearance of Type Material:
Brown prismatic crystals, up to 200 μm in length.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo di Storia Naturale, Universita` di Pisa, Via Roma 79, Calci (Pisa), Italy, catalogue number 19689
Associated Minerals at Type Locality:

Physical Properties of Ferri-kaersutite

Vitreous
Colour:
Brown
Cleavage:
Perfect
{110}

Crystallography of Ferri-kaersutite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Cell Parameters:
a = 9.8378(8) Å, b = 18.0562(9) Å, c = 5.3027(4) Å
β = 105.199(9)°
Ratio:
a:b:c = 0.545 : 1 : 0.294
Unit Cell Volume:
V 908.99 ų
Z:
2
Morphology:
Prismatic crystals, up to 200 μm in length (TL).
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.4(s)
3.379(ms)
3.266(m)
3.115(ms)
2.938(m)
2.707(s)
2.598(ms)

Chemical Properties of Ferri-kaersutite

Formula:
NaCa2(Mg3Fe3+Ti)(Al2Si6O22)O2

The Kaersutite group minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
B: Ca dominant
CTi > 0.5 apfu and
WO > 1.0 apfu


Ferri-kaersutite is defined with
A position: Na dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
All elements listed in formula:
Analytical Data:
From Gentili et al (2016): Combination of electron microprobe, SIMS, and 57Fe Mössbauer spectroscopy. Empirical formula based on 24 anions per formula unit.
SiO2 (41.69)
TiO2 (5.30)
Al2O3 (13.65)
Cr2O3 (0.09)
Fe2O3 (4.52)
MgO (15.54)
CaO (11.03)
MnO (0.11)
FeO (2.83)
Na2O (2.88)
K2O (0.96)
H2O (0.70)
F (0.24)
Cl (0.08)
O=(F,Cl) (−0.12)
sum 99.50 wt%
Empirical Formula:
(Na0.816K0.179)∑0.995(Ca1.726Fe2+0.258Mn0.014)∑1.998(Mg3.383Fe2+0.088Ti0.582Fe3+0.497Al0.439Cr0.011)∑5.00 (Si6.089Al1.911)∑8.00O22[O1.187(OH)0.682F0.111Cl0.020]∑2.00

Relationship of Ferri-kaersutite to other Species

Other Members of Group:
Ferro-kaersutite{Na}{Ca2}{Fe32+AlTi}(Al2Si6O22)O2
Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ferri-kaersutite

Reference List:
Kent Brooks, R.G Platt (1975) Kaersutite-bearing gabbroic inclusions and the late
dike swarm of Kangerdlugssuaq, East Greenland. Mineralogical Magazine: 40: 259-283.

Zaitsev, A.N., Avdontseva, E.Y.,Britvin, S.N., Deme´ny, A., Homonnay, Z., Jeffries, T., Keller, J., Krivovichev, V.G., Markl, G., Platonova, N.V., Siidra, O.I., Spratt, J. (2011) Ferrikaersutite, IMA 2011-035. CNMNC Newsletter No. 10, October 2011, 2556.

Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031–2048.

Zaitsev, A.N., Avdontseva, E.Y., Britvin, S.N., Demény, A., Homonnay, Z., Jeffries, T.E., Keller, J., Krivovichev, V.G., Markl, G., Platonova, N.V., Siidra, O.I., Spratt, J., Vennemann, T. (2013) Oxo-magnesio-hastingsite, NaCa2(Mg2Fe3+3)(Al2Si6)O22O2, a new anhydrous amphibole from the Deeti volcanic cone, Gregory rift, northern Tanzania. Mineralogical Magazine: 77: 2773-2792.

Gentili, S., Biagioni, C., Comodi, P., Pasero, M., McCammon, C., Bonadiman, C. (2014) Ferri-kaersutite, IMA 2014-051. CNMNC Newsletter No. 22, October 2014, page 1245; Mineralogical Magazine: 78: 1241-1248.

Gentili, S., Biagioni, C., Comodi, P., Pasero, M., McCammon, C., Bonadiman, C. (2016) Ferri-kaersutite, NaCa2(Mg3TiFe3+)(Si6Al2)O22O2, a new oxo-amphibole from Harrow Peaks, Northern Victoria Land, Antarctica. American Mineralogist: 101: 461-468.

Internet Links for Ferri-kaersutite

Localities for Ferri-kaersutite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Antarctica (TL)
 
  • Eastern Antarctica
    • Victoria Land
Gentili, S., Biagioni, C., Comodi, P., Pasero, M., McCammon, C. and Bonadiman, C. (2014) Ferri-kaersutite, IMA 2014-051. CNMNC Newsletter No. 22, October 2014, page 1245; Mineralogical Magazine, 78, 1241-1248; Gentili, S., Biagioni, C., Comodi, P., Pasero, M., Mccammon, C., Bonadiman, C. (2016): Ferri-kaersutite, NaCa2(Mg3TiFe3+)(Si6Al2)O22O2, a new oxo-amphibole from Harrow Peaks, Northern Victoria Land, Antarctica. American Mineralogist, 101, 461-468
Germany
 
  • Rhineland-Palatinate
    • Eifel
      • Mayen
        • Ettringen
          • Bellerberg volcano
in the collection of Christof Schäfer. ID verified by EMPA and SXRD
      • Mendig
        • Bell
Nikita Chukanov exchange list
Greenland
 
  • Sermersooq
Kent Brooks, R.G Platt (1975): Kaersutite-bearing gabbroic inclusions and the late dike swarm of Kangerdlugssuaq, East Greenland. Mineralogical Magazine Vol 40 pp 259-283
Mineral and/or Locality  
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